sh: Make kgdb i-cache flushing less inept.

kgdb had its own ranged I-cache flushing routine that attempted to
duplicate the flush_icache_range() functionality, but managed to do
an explicit D-cache writeback & invalidate twice on SH-4. This is
a no-op for SH-3, and the flush_icache_range() semantics already do
what kgdb was feebly attempting to do already, so just move over to
that and kill off the wrapper.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/kgdb.h

@@ -17,7 +17,6 @@
 #define __KGDB_H
 
 #include <asm/ptrace.h>
-#include <asm/cacheflush.h>
 
 /* Same as pt_regs but has vbr in place of syscall_nr */
 struct kgdb_regs {
@@ -67,17 +66,6 @@ extern int     setjmp(jmp_buf __jmpb);
 /* Forced breakpoint */
 #define breakpoint()	__asm__ __volatile__("trapa   #0x3c")
 
-/* KGDB should be able to flush all kernel text space */
-#if defined(CONFIG_CPU_SH4)
-#define kgdb_flush_icache_range(start, end) \
-{									\
-	__flush_purge_region((void*)(start), (int)(end) - (int)(start));\
-	flush_icache_range((start), (end));				\
-}
-#else
-#define kgdb_flush_icache_range(start, end)	do { } while (0)
-#endif
-
 /* Taken from sh-stub.c of GDB 4.18 */
 static const char hexchars[] = "0123456789abcdef";