kernel: Bump to 4.4.48

kernel: gpio_mem: Remove unnecessary dev_info output (#1830)
See: raspberrypi/linux#1830

kernel: vc4-kms-v3d: VC4 crash fix, performance improvement, and sanity checking
See: raspberrypi/linux#1835

Author: popcornmix

boot/kernel.img

@@ -5744,6 +5744,7 @@
 0x33b7898a	queue_kthread_work	vmlinux	EXPORT_SYMBOL_GPL
 0x4f15b972	dwc_cc_remove	vmlinux	EXPORT_SYMBOL
 0x011a9e53	elf_hwcap2	vmlinux	EXPORT_SYMBOL
+0x9c0b8248	cma_get_size	vmlinux	EXPORT_SYMBOL
 0xb5cf8966	sock_gen_put	vmlinux	EXPORT_SYMBOL_GPL
 0x9cab34a6	rfkill_set_led_trigger_name	net/rfkill/rfkill	EXPORT_SYMBOL
 0xaa6f23ad	rfkill_get_led_trigger_name	net/rfkill/rfkill	EXPORT_SYMBOL
@@ -6542,6 +6543,7 @@
 0xe702a8d6	drm_modeset_backoff_interruptible	drivers/gpu/drm/drm	EXPORT_SYMBOL
 0x2f0d9053	usb_otg_state_string	vmlinux	EXPORT_SYMBOL_GPL
 0xf2997713	tty_termios_hw_change	vmlinux	EXPORT_SYMBOL
+0x6f762933	cma_get_base	vmlinux	EXPORT_SYMBOL
 0xab7cc5c4	seq_path	vmlinux	EXPORT_SYMBOL
 0x783b3563	wake_up_atomic_t	vmlinux	EXPORT_SYMBOL
 0x5a65f2ab	fat_search_long	vmlinux	EXPORT_SYMBOL_GPL
@@ -9068,6 +9070,7 @@
 0x40a9b349	vzalloc	vmlinux	EXPORT_SYMBOL
 0x5080c8f7	device_for_each_child	vmlinux	EXPORT_SYMBOL_GPL
 0xcd5693fb	i2c_new_device	vmlinux	EXPORT_SYMBOL_GPL
+0x4fd950ed	dma_contiguous_default_area	vmlinux	EXPORT_SYMBOL
 0xd1b3e713	cfg80211_reg_can_beacon_relax	net/wireless/cfg80211	EXPORT_SYMBOL
 0xe129ac23	cfg80211_inform_bss_frame_data	net/wireless/cfg80211	EXPORT_SYMBOL
 0xa5541cb0	ieee80211_free_hw	net/mac80211/mac80211	EXPORT_SYMBOL

boot/kernel7.img

@@ -5806,6 +5806,7 @@
 0x748accef	queue_kthread_work	vmlinux	EXPORT_SYMBOL_GPL
 0x4f15b972	dwc_cc_remove	vmlinux	EXPORT_SYMBOL
 0x011a9e53	elf_hwcap2	vmlinux	EXPORT_SYMBOL
+0xf98bf423	cma_get_size	vmlinux	EXPORT_SYMBOL
 0x0d14e462	sock_gen_put	vmlinux	EXPORT_SYMBOL_GPL
 0x9cab34a6	rfkill_set_led_trigger_name	net/rfkill/rfkill	EXPORT_SYMBOL
 0xaa6f23ad	rfkill_get_led_trigger_name	net/rfkill/rfkill	EXPORT_SYMBOL
@@ -6612,6 +6613,7 @@
 0x3aeeed6a	drm_modeset_backoff_interruptible	drivers/gpu/drm/drm	EXPORT_SYMBOL
 0x2f0d9053	usb_otg_state_string	vmlinux	EXPORT_SYMBOL_GPL
 0xf2997713	tty_termios_hw_change	vmlinux	EXPORT_SYMBOL
+0x9d75e037	cma_get_base	vmlinux	EXPORT_SYMBOL
 0xc24c0c41	seq_path	vmlinux	EXPORT_SYMBOL
 0x783b3563	wake_up_atomic_t	vmlinux	EXPORT_SYMBOL
 0x4c5b1ada	fat_search_long	vmlinux	EXPORT_SYMBOL_GPL
@@ -9161,6 +9163,7 @@
 0x40a9b349	vzalloc	vmlinux	EXPORT_SYMBOL
 0xb123a208	device_for_each_child	vmlinux	EXPORT_SYMBOL_GPL
 0xb8459ed7	i2c_new_device	vmlinux	EXPORT_SYMBOL_GPL
+0x4fd950ed	dma_contiguous_default_area	vmlinux	EXPORT_SYMBOL
 0x6ce81329	cfg80211_reg_can_beacon_relax	net/wireless/cfg80211	EXPORT_SYMBOL
 0x36d656b6	cfg80211_inform_bss_frame_data	net/wireless/cfg80211	EXPORT_SYMBOL
 0xcaaf575d	ieee80211_free_hw	net/mac80211/mac80211	EXPORT_SYMBOL