at91: kernel v5.15: use KERNEL_TESTING_PATCHVER:=5.15

Use KERNEL_TESTING_PATCHVER:=15 for at91 targets.

Signed-off-by: Claudiu Beznea <[email protected]>

target/linux/at91/Makefile

@@ -11,6 +11,7 @@ FEATURES:=ext4 squashfs targz usbgadget ubifs
 SUBTARGETS:=sama7 sama5 sam9x
 
 KERNEL_PATCHVER:=5.10
+KERNEL_TESTING_PATCHVER:=5.15
 
 include $(INCLUDE_DIR)/target.mk