powerpc/85xx: Make some pic_init functions static

These functions can all be static, make them so, which also fixes no
previous prototype warnings.

Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

arch/powerpc/platforms/85xx/bsc913x_qds.c

···
 #include "mpc85xx.h"
 #include "smp.h"
 
-void __init bsc913x_qds_pic_init(void)
+static void __init bsc913x_qds_pic_init(void)
 {
 	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 	  MPIC_SINGLE_DEST_CPU,

arch/powerpc/platforms/85xx/bsc913x_rdb.c

···
 
 #include "mpc85xx.h"
 
-void __init bsc913x_rdb_pic_init(void)
+static void __init bsc913x_rdb_pic_init(void)
 {
 	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 	  MPIC_SINGLE_DEST_CPU,

arch/powerpc/platforms/85xx/ge_imp3a.c

···
 
 void __iomem *imp3a_regs;
 
-void __init ge_imp3a_pic_init(void)
+static void __init ge_imp3a_pic_init(void)
 {
 	struct mpic *mpic;
 	struct device_node *np;