omap: add generic subtarget

Same game as for 853e4dd3062df7cb5704b15d6af6730e3194b571. Add generic
to the filenames.

Signed-off-by: Christian Marangi <[email protected]>

target/linux/omap/Makefile

@@ -10,6 +10,7 @@ BOARDNAME:=TI OMAP3/4/AM33xx
 FEATURES:=usb usbgadget ext4 targz fpu audio display nand rootfs-part squashfs
 CPU_TYPE:=cortex-a8
 CPU_SUBTYPE:=vfpv3
+SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=5.10
 KERNEL_TESTING_PATCHVER:=5.15

target/linux/omap/generic/target.mk

@@ -0,0 +1 @@
+BOARDNAME:=Generic