hikey: fix assert in sec_protect()

`assert(e)` was used in place of `if (e) ERROR()` when sec_protect()
was ported from hikey fork so the logic should have been reversed.

Fixes: 3d5d9f5a ("hikey: configure the top 16MB of DRAM as secure")
Fixes: 52988b38

 ("hikey: configure 4 MB of secure DRAM for OP-TEE
Secure Data Path")
Signed-off-by: Victor Chong <victor.chong@linaro.org>
Tested-by: Victor Chong <victor.chong@linaro.org>

plat/hisilicon/hikey/hikey_security.c

@@ -71,10 +71,12 @@ static void sec_protect(uint32_t region_base, uint32_t region_size,
 	volatile struct rgn_attr_reg *rgn_attr;
 	uint32_t i = 0;
 
-	assert(region < 1 || region > 15);
-	assert(!IS_POWER_OF_TWO(region_size) || region_size < 0x10000);
-	/* ensure secure region_base is aligned to region_size */
-	assert((region_base & (region_size - 1)));
+	/* ensure secure region number is between 1-15 */
+	assert(region > 0 && region < 16);
+	/* ensure secure region size is a power of 2 >= 64KB */
+	assert(IS_POWER_OF_TWO(region_size) && region_size >= 0x10000);
+	/* ensure secure region address is aligned to region size */
+	assert(!(region_base & (region_size - 1)));
 
 	INFO("BL2: TrustZone: protecting %u bytes of memory at 0x%x\n", region_size,
 	     region_base);