configs: Raise 8250 UART limit to 5 on BCM2711

8250 UARTs are available as PCIe devices, and there is already a config
setting enabling the driver support, but the driver also has a hard
limit on the number of instances - currently set to 1. Raise that
limit to 5.

See: #5590
     https://forums.raspberrypi.com/viewtopic.php?t=355689

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

arch/arm/configs/bcm2711_defconfig

@@ -667,7 +667,7 @@ CONFIG_SERIAL_8250=y
 # CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
 CONFIG_SERIAL_8250_CONSOLE=y
 # CONFIG_SERIAL_8250_DMA is not set
-CONFIG_SERIAL_8250_NR_UARTS=1
+CONFIG_SERIAL_8250_NR_UARTS=5
 CONFIG_SERIAL_8250_RUNTIME_UARTS=0
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y

arch/arm64/configs/bcm2711_defconfig

@@ -677,7 +677,7 @@ CONFIG_SERIAL_8250=y
 # CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
 CONFIG_SERIAL_8250_CONSOLE=y
 # CONFIG_SERIAL_8250_DMA is not set
-CONFIG_SERIAL_8250_NR_UARTS=1
+CONFIG_SERIAL_8250_NR_UARTS=5
 CONFIG_SERIAL_8250_RUNTIME_UARTS=0
 CONFIG_SERIAL_8250_EXTENDED=y
 CONFIG_SERIAL_8250_SHARE_IRQ=y