hikey*: Undef BL32_BASE when building without SPD

Otherwise, BL2 tries to load a BL32 image and triggers
assert(result == 0)
in
plat_get_image_source()
in hikey{960}_io_storage.c
in a debug build, or displays
ERROR:   BL2: Failed to load image
in a release build.
Signed-off-by: Victor Chong <victor.chong@linaro.org>

plat/hisilicon/hikey/include/platform_def.h

@@ -135,6 +135,13 @@
 #error "Currently unsupported HIKEY_TSP_LOCATION_ID value"
 #endif
 
+/* BL32 is mandatory in AArch32 */
+#ifndef AARCH32
+#ifdef SPD_none
+#undef BL32_BASE
+#endif /* SPD_none */
+#endif
+
 #define NS_BL1U_BASE			(BL2_BASE)
 #define NS_BL1U_SIZE			(0x00010000)
 #define NS_BL1U_LIMIT			(NS_BL1U_BASE + NS_BL1U_SIZE)

plat/hisilicon/hikey960/include/platform_def.h

@@ -94,6 +94,13 @@
 #error "Currently unsupported HIKEY960_TSP_LOCATION_ID value"
 #endif
 
+/* BL32 is mandatory in AArch32 */
+#ifndef AARCH32
+#ifdef SPD_none
+#undef BL32_BASE
+#endif /* SPD_none */
+#endif
+
 #define NS_BL1U_BASE			(BL31_LIMIT)		/* 1AC9_8000 */
 #define NS_BL1U_SIZE			(0x00100000)
 #define NS_BL1U_LIMIT			(NS_BL1U_BASE + NS_BL1U_SIZE)