efi: Make unexported efi_rci2_sysfs_init() static

The efi_rci2_sysfs_init() is not used outside of rci2-table.c so
make it static to silence the following Sparse warning:

  drivers/firmware/efi/rci2-table.c:79:12: warning: symbol 'efi_rci2_sysfs_init' was not declared. Should it be static?

Signed-off-by: Ben Dooks <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Cc: Jerry Snitselaar <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lukas Wunner <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Matthew Garrett <[email protected]>
Cc: Octavian Purdila <[email protected]>
Cc: Peter Jones <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Scott Talbert <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

Author: bjdooks-ct

drivers/firmware/efi/rci2-table.c

@@ -76,7 +76,7 @@ static u16 checksum(void)
 	return chksum;
 }
 
-int __init efi_rci2_sysfs_init(void)
+static int __init efi_rci2_sysfs_init(void)
 {
 	struct kobject *tables_kobj;
 	int ret = -ENOMEM;