Staging: htc: Dream: limit Kconfig for only MSM platforms

Limit SMD communication glue to MSM platform. It is closely tied to
MSM architecture.
Signed-off-by: NPavel Machek <pavel@ucw.cz>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/dream/smd/Kconfig

 config MSM_SMD
+	depends on ARCH_MSM
 	default y
 	bool "MSM Shared Memory Driver (SMD)"
 	help