MIPS: Alchemy: Fix missing prototypes

We have a number of missing prototypes warnings for board_setup(),
alchemy_set_lpj() and prom_init_cmdline(), prom_getenv() and
prom_get_ethernet_addr(). Fix those by providing definitions for the
first two functions in au1000.h which is included everywhere relevant,
and including prom.h for the last three.

Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/alchemy/common/prom.c

···
 #include <linux/string.h>
 
 #include <asm/bootinfo.h>
+#include <prom.h>
 
 int prom_argc;
 char **prom_argv;

arch/mips/alchemy/common/setup.c

···
 #include <linux/mm.h>
 #include <linux/dma-map-ops.h> /* for dma_default_coherent */
 
+#include <asm/bootinfo.h>
 #include <asm/mipsregs.h>
 
 #include <au1000.h>
-
-extern void __init board_setup(void);
-extern void __init alchemy_set_lpj(void);
 
 static bool alchemy_dma_coherent(void)
 {

arch/mips/include/asm/mach-au1x00/au1000.h

···
 
 #include <asm/cpu.h>
 
+void alchemy_set_lpj(void);
+void board_setup(void);
+
 /* helpers to access the SYS_* registers */
 static inline unsigned long alchemy_rdsys(int regofs)
 {