octeontx: switch to kernel 5.4

5.4 is stable on Gateworks Newport GW610x/GW620x/GW630x/GW640x

Signed-off-by: Tim Harvey <[email protected]>

target/linux/octeontx/Makefile

@@ -11,8 +11,7 @@ BOARD:=octeontx
 BOARDNAME:=Octeon-TX
 FEATURES:=targz pcie gpio rtc usb fpu
 
-KERNEL_PATCHVER:=4.14
-KERNEL_TESTING_PATCHVER:=5.4
+KERNEL_PATCHVER:=5.4
 
 define Target/Description
 	Build images for Octeon-TX CN80XX/CN81XX based boards