octeontx: add generic subtarget

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

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

target/linux/octeontx/Makefile

@@ -8,6 +8,7 @@ ARCH:=aarch64
 BOARD:=octeontx
 BOARDNAME:=Octeon-TX
 FEATURES:=targz pcie gpio rtc usb fpu
+SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=5.10
 

target/linux/octeontx/generic/target.mk

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