platform: mdm9640,msm_shared: Rename target sdxhedgehog to sdx20

Rename target sdxhedgehog to sdx20.

Change-Id: I68ab342a7ff84f622915a1fba40b3b33856503e2
diff --git a/platform/msm_shared/smem.h b/platform/msm_shared/smem.h
index 2fa7090..5919e47 100644
--- a/platform/msm_shared/smem.h
+++ b/platform/msm_shared/smem.h
@@ -459,8 +459,8 @@
 	MSM8996AU = 310,
 	APQ8096AU = 311,
 	APQ8096SG = 312,
-	SDXHEDGEHOG1 = 314,
-	SDXHEDGEHOG2 = 333,
+	SDX201 = 314,
+	SDX202 = 333,
 	MSM8909W = 300,
 	APQ8009W = 301,
 	MDM9206 = 322