linux/kernel.h: define SYMBOL_PREFIX

linux/kernel.h: define SYMBOL_PREFIX

Define SYMBOL_PREFIX to be the same as CONFIG_SYMBOL_PREFIX if set by
the architecture, or "" otherwise. This avoids the need for ugly #ifdefs
whenever symbols are referenced in asm blocks.

Signed-off-by: James Hogan <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Jean Delvare <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Mike Frysinger <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>