vboot-utils: MTD_CHAR_MAJOR definition

Fixes
http://autobuild.buildroot.net/results/a6360fd21314899321071c34fcb4892c5eed9bcc/
http://autobuild.buildroot.net/results/0af3aa4a429c45d3a2609913ec1040f32378f3c8/
http://autobuild.buildroot.net/results/cc4940fd6f51b31d71014f5aedee5223180eb36e/

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/vboot-utils/0001-mtd-char-major.patch

@@ -0,0 +1,17 @@
+This definition missing from <linux/major.h> for kernels <= 3.13.
+
+Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
+
+--- a/cgpt/cgpt_wrapper.c
++++ b/cgpt/cgpt_wrapper.c
+@@ -25,6 +25,10 @@
+ #include "cgpt_nor.h"
+ #include "cryptolib.h"
+ 
++#ifndef MTD_CHAR_MAJOR
++#define MTD_CHAR_MAJOR 90
++#endif
++
+ // Check if cmdline |argv| has "-D". "-D" signifies that GPT structs are stored
+ // off device, and hence we should not wrap around cgpt.
+ static bool has_dash_D(int argc, const char *const argv[]) {