linux-raspberrypi-rt: Update 4.19 recipe to 4.19.71

Signed-off-by: Vincenzo Pacella <shaduz@shaduzlabs.com>

recipes-kernel/linux/linux-raspberrypi-rt_4.19.bb

@@ -1,6 +1,6 @@
-LINUX_VERSION ?= "4.19.59"
+LINUX_VERSION ?= "4.19.71"
 LINUX_RPI_BRANCH ?= "rpi-4.19.y-rt"
 
-SRCREV = "1dae1f0521d69bfd22454180c40fe85fdd80ffc6"
+SRCREV = "1532ea50263c8fd70f769b55e60fbc6a0c5778a0"
 
 require linux-raspberrypi_4.19.inc