m68k/nommu: prevent setting ROMKERNEL when ROM is not set

When CONFIG_ROMKERNEL is set but CONFIG_ROM is not set, the linker
complains:
m68k-linux-ld:./arch/m68k/kernel/vmlinux.lds:5: undefined symbol `CONFIG_ROMSTART' referenced in expression

# CONFIG_ROM is not set
# CONFIG_RAMKERNEL is not set
CONFIG_ROMKERNEL=y

Since ROMSTART depends on ROM, make ROMKERNEL also depend on ROM.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Greg Ungerer <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Greg Ungerer <[e-mail]>

arch/m68k/Kconfig.machine

···
 
 config ROMKERNEL
 	bool "ROM"
+	depends on ROM
 	help
 	  The kernel will be resident in FLASH/ROM when running. This is
 	  often referred to as Execute-in-Place (XIP), since the kernel