defconfig: sdxpoorwills: enable Diag

Enable Diag for sdxpoorwills target.

Change-Id: Ib3e572b6a99cf91b48663a80f084c83549a143cc
Signed-off-by: Chris Lew <clew@codeaurora.org>
diff --git a/arch/arm/configs/sdxpoorwills-perf_defconfig b/arch/arm/configs/sdxpoorwills-perf_defconfig
index a9fa2b2..1826b6f 100644
--- a/arch/arm/configs/sdxpoorwills-perf_defconfig
+++ b/arch/arm/configs/sdxpoorwills-perf_defconfig
@@ -195,6 +195,7 @@
 CONFIG_INPUT_GPIO=m
 CONFIG_SERIO_LIBPS2=y
 # CONFIG_LEGACY_PTYS is not set
+CONFIG_DIAG_CHAR=y
 CONFIG_HW_RANDOM=y
 CONFIG_I2C=y
 CONFIG_I2C_CHARDEV=y