package/flashrom: disable on microblaze and xtensa

Fixes:
 - http://autobuild.buildroot.org/results/cdf0fb462eec143ea881d43cdd0c69c86122f66b
 - http://autobuild.buildroot.org/results/df4d9702959b610762e87cf21fac9de62365dae6

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 582448032d97b9dc6b196d838f57ec7f695048ba)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/flashrom/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_FLASHROM
 	bool "flashrom"
+	depends on !BR2_microblaze && !BR2_xtensa # platform.h
 	help
 	  flashrom is a utility for identifying, reading, writing,
 	  verifying and erasing flash chips. It is designed to flash