Correct platform SDK version

P has broken with the O-MR1 HALs, but hasn't updated the SDK version.

BUG: 70526789
Test: Local build
Change-Id: I195589a280ef786d30c9fb7a23a8a25c7cced657
diff --git a/shared/BoardConfig.mk b/shared/BoardConfig.mk
index df88094..67e0ed7 100644
--- a/shared/BoardConfig.mk
+++ b/shared/BoardConfig.mk
@@ -90,8 +90,8 @@
 
 # master has breaking changes in dlfcn.h, but the platform SDK hasn't been
 # bumped. Restore the line below when it is.
-# VSOC_VERSION_CFLAGS := -DVSOC_PLATFORM_SDK_VERSION=26
-VSOC_VERSION_CFLAGS := -DVSOC_PLATFORM_SDK_VERSION=${PLATFORM_SDK_VERSION}
+VSOC_VERSION_CFLAGS := -DVSOC_PLATFORM_SDK_VERSION=28
+# VSOC_VERSION_CFLAGS := -DVSOC_PLATFORM_SDK_VERSION=${PLATFORM_SDK_VERSION}
 VSOC_STLPORT_INCLUDES :=
 VSOC_STLPORT_LIBS :=
 VSOC_STLPORT_STATIC_LIBS :=