cmd/Kconfig: Add more dependencies to OSE bootm support

Per Enea OSE documentation, it supports some classes of ARM, PowerPC and
X86.  Limit the option to those platforms.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 4e29e7b..5f2562b 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -294,6 +294,7 @@
 
 config BOOTM_OSE
 	bool "Support booting Enea OSE images"
+	depends on (ARM && (ARM64 || CPU_V7A || CPU_V7R) || SANDBOX || PPC || X86)
 	depends on CMD_BOOTM
 	help
 	  Support booting Enea OSE images via the bootm command.