Generalize the naming of the bootfiles deploy directory

The raspberry pi 4 variant has a BCM2711 chip, however it still
uses the same boot files as the BCM2835 used in previous generations.
This change generalizes the naming of the directory generated in the
$DEPLOY_DIR to avoid the implication that the files are only
meant for the BCM2835.

Signed-off-by: Jeff Ithier <ithijme@gmail.com>

recipes-kernel/linux/linux-raspberrypi.inc

@@ -131,10 +131,10 @@ do_compile_append() {
 
 do_deploy_append() {
     # Deploy cmdline.txt
-    install -d ${DEPLOYDIR}/bcm2835-bootfiles
+    install -d ${DEPLOYDIR}/${BOOTFILES_DIR_NAME}
     PITFT="${@bb.utils.contains("MACHINE_FEATURES", "pitft", "1", "0", d)}"
     if [ ${PITFT} = "1" ]; then
         PITFT_PARAMS="fbcon=map:10 fbcon=font:VGA8x8"
     fi
-    echo "${CMDLINE}${PITFT_PARAMS}" > ${DEPLOYDIR}/bcm2835-bootfiles/cmdline.txt
+    echo "${CMDLINE}${PITFT_PARAMS}" > ${DEPLOYDIR}/${BOOTFILES_DIR_NAME}/cmdline.txt
 }