ras: mark stub functions as 'inline'

With CONFIG_RAS disabled, we get two harmless warnings about
unused functions:

include/linux/ras.h:37:13: error: 'log_arm_hw_error' defined but not used [-Werror=unused-function]
 static void log_arm_hw_error(struct cper_sec_proc_arm *err) { return; }
include/linux/ras.h:33:13: error: 'log_non_standard_event' defined but not used [-Werror=unused-function]
 static void log_non_standard_event(const guid_t *sec_type,

Clearly these are meant to be 'inline', like the other stubs
in the same header.

Fixes: 297b64c7 ("ras: acpi / apei: generate trace event for unrecognized CPER section")
Fixes: e9279e83

 ("trace, ras: add ARM processor error trace event")
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>