kernel: Bump to 5.4.50

kernel: drm/vc4: Allow interlaced HDMI modes from FKMS
See: raspberrypi/linux#3698

kernel: Isp driver fixes
See: raspberrypi/linux#3695

kernel: Add Bluetooth overlays
See: raspberrypi/linux#3682

firmware: arm_loader: Allow interlaced HDMI modes from FKMS
See: raspberrypi/linux#3698

firmware: arm_loader: Limit rather than reject boosts with disable_auto_turbo

firmware: i2c: Clearing the TA bit may time out
See: #1422

firmware: arm_loader: Add an accelerated memmove
firmware: arm_loader: memmove kernel to preferred text_offset
See: #1421

firmware: filesystem: Fix GPT regression on USB after SD fix
See: #1420

firmware: bootloader: Some tweaks for LED, UART, USB timeouts

Author: popcornmix

boot/bcm2708-rpi-b-plus.dtb

@@ -162,6 +162,13 @@ Params:
         i2s                     Set to "on" to enable the i2s interface
                                 (default "off")
 
+        krnbt                   Set to "on" to enable autoprobing of Bluetooth
+                                driver without need of hciattach/btattach
+                                (default "off")
+
+        krnbt_baudrate          Set the baudrate of the PL011 UART when used
+                                with krnbt=on
+
         spi                     Set to "on" to enable the spi interfaces
                                 (default "off")
 
@@ -1430,6 +1437,22 @@ Load:   dtoverlay=imx219
 Params: <None>
 
 
+Name:   imx290
+Info:   Sony IMX290 camera module.
+        Uses Unicam 1, which is the standard camera connector on most Pi
+        variants. NB This currently uses 4 CSI2 data lanes and therefore will
+        only work on a CM.
+Load:   dtoverlay=imx290,<param>
+Params: 4lane                   Enable 4 CSI2 lanes. This requires a Compute
+                                Module (1, 3, or 4).
+        clock-frequency         Sets the clock frequency to match that used on
+                                the board.
+                                Modules from Vision Components use 37.125MHz
+                                (the default), whilst those from Innomaker use
+                                74.25MHz.
+        mono                    Denote that the module is a mono sensor.
+
+
 Name:   imx477
 Info:   Sony IMX477 camera module.
         Uses Unicam 1, which is the standard camera connector on most Pi
@@ -1748,8 +1771,9 @@ Info:   Switch the onboard Bluetooth function on Pi 3B, 3B+, 3A+, 4B and Zero W
         in which case use /dev/serial1 instead because it will always be
         correct. Furthermore, you must also set core_freq and core_freq_min to
         the same value in config.txt or the miniuart will not work.
-Load:   dtoverlay=miniuart-bt
-Params: <None>
+Load:   dtoverlay=miniuart-bt,<param>=<val>
+Params: krnbt                   Set to "on" to enable autoprobing of Bluetooth
+                                driver without need of hciattach/btattach
 
 
 Name:   mmc