[POWERPC] Fix section mismatches in udbg_adb.c

The functions are only called from __init functions.

WARNING: vmlinux.o(.text+0x45ed0): Section mismatch: reference to .init.text:.btext_find_display (between '.udbg_adb_init_early' and '.udbg_adb_init')
WARNING: vmlinux.o(.text+0x45f9c): Section mismatch: reference to .init.text:.btext_find_display (between '.udbg_adb_init' and '.udbg_adb_getc_poll')
WARNING: vmlinux.o(.text+0x46000): Section mismatch: reference to .init.text:.find_via_pmu (between '.udbg_adb_init' and '.udbg_adb_getc_poll')
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/powermac/udbg_adb.c

@@ -149,7 +149,7 @@ static void udbg_adb_putc(char c)
 		return udbg_adb_old_putc(c);
 }
 
-void udbg_adb_init_early(void)
+void __init udbg_adb_init_early(void)
 {
 #ifdef CONFIG_BOOTX_TEXT
 	if (btext_find_display(1) == 0) {
@@ -159,7 +159,7 @@ void udbg_adb_init_early(void)
 #endif
 }
 
-int udbg_adb_init(int force_btext)
+int __init udbg_adb_init(int force_btext)
 {
 	struct device_node *np;