boot: change some arch ifdefs to feature ifdefs

The routines boot_ramdisk_high, boot_get_cmdline and boot_get_kbd
are currently enabled by various combinations of CONFIG_M68K,
CONFIG_POWERPC and CONFIG_SPARC.

Use CONFIG_SYS_BOOT_<FEATURE> defines instead.

CONFIG_SYS_BOOT_RAMDISK_HIGH
CONFIG_SYS_BOOT_GET_CMDLINE
CONFIG_SYS_BOOT_GET_KBD

Define these as appropriate in arch/include/asm/config.h files.

Signed-off-by: John Rigby <john.rigby@linaro.org>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/image.c b/common/image.c
index dda3025..385464d 100644
--- a/common/image.c
+++ b/common/image.c
@@ -992,7 +992,7 @@
 	return 0;
 }
 
-#if defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC)
+#ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH
 /**
  * boot_ramdisk_high - relocate init ramdisk
  * @lmb: pointer to lmb handle, will be used for memory mgmt
@@ -1081,7 +1081,7 @@
 error:
 	return -1;
 }
-#endif /* defined(CONFIG_PPC) || defined(CONFIG_M68K) || defined(CONFIG_SPARC) */
+#endif /* CONFIG_SYS_BOOT_RAMDISK_HIGH */
 
 #ifdef CONFIG_OF_LIBFDT
 static void fdt_error (const char *msg)
@@ -1588,7 +1588,7 @@
 }
 #endif /* CONFIG_OF_LIBFDT */
 
-#if defined(CONFIG_PPC) || defined(CONFIG_M68K)
+#ifdef CONFIG_SYS_BOOT_GET_CMDLINE
 /**
  * boot_get_cmdline - allocate and initialize kernel cmdline
  * @lmb: pointer to lmb handle, will be used for memory mgmt
@@ -1630,7 +1630,9 @@
 
 	return 0;
 }
+#endif /* CONFIG_SYS_BOOT_GET_CMDLINE */
 
+#ifdef CONFIG_SYS_BOOT_GET_KBD
 /**
  * boot_get_kbd - allocate and initialize kernel copy of board info
  * @lmb: pointer to lmb handle, will be used for memory mgmt
@@ -1663,7 +1665,7 @@
 
 	return 0;
 }
-#endif /* CONFIG_PPC || CONFIG_M68K */
+#endif /* CONFIG_SYS_BOOT_GET_KBD */
 #endif /* !USE_HOSTCC */
 
 #if defined(CONFIG_FIT)