scripts: build_all: build sdx defconfigs

Add support for building new sdx defconfigs.

Change-Id: I81c0ee59aab46f131609dd99b7db798460a19f01
Signed-off-by: Runmin Wang <runminw@codeaurora.org>
diff --git a/scripts/build-all.py b/scripts/build-all.py
index d36e96f..bd468cd 100755
--- a/scripts/build-all.py
+++ b/scripts/build-all.py
@@ -307,10 +307,12 @@
         r'qsd*_defconfig',
         r'mpq*_defconfig',
         r'sdm[0-9]*_defconfig',
+        r'sdx*_defconfig',
         )
     arch64_pats = (
         r'msm*_defconfig',
         r'sdm[0-9]*_defconfig',
+        r'sdx*_defconfig',
         )
     for p in arch_pats:
         for n in glob.glob('arch/arm/configs/' + p):