MIPS: FW: Remove obsolete header file for MTI platforms.

Remove 'arch/mips/include/asm/mips-boards/prom.h' and get rid of
all inclusions of it by Malta and SEAD-3 platforms.

[ralf@linux-mips.org: Fold in John Crispin <blogic@openwrt.org>'s "MIPS:
ar7 powertv build"].

[ralf@linux-mips.org: Fold in John Crispin <blogic@openwrt.org>'s "MIPS:
unbreak powertv build"].

[ralf@linux-mips.org: Test. Build. Your. Fscking. Code. Or...]

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
diff --git a/arch/mips/powertv/init.h b/arch/mips/powertv/init.h
index b194c34..c1a8bd0 100644
--- a/arch/mips/powertv/init.h
+++ b/arch/mips/powertv/init.h
@@ -23,4 +23,6 @@
 #ifndef _POWERTV_INIT_H
 #define _POWERTV_INIT_H
 extern unsigned long _prom_memsize;
+extern void prom_meminit(void);
+extern char *prom_getenv(char *name);
 #endif