env_mmc: fix buffer allocation for armv7

commit d196bd8803 adds
redundand environment to mmc. The usage of malloc in
env_relocate_spec triggers cache errors on armv7.

Tested on a not mainlined i.MX53 board:

Board: TQMa53
I2C:   ready
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
ERROR: v7_dcache_inval_range - start address is not aligned - 0x8f57c2d8
ERROR: v7_dcache_inval_range - stop address is not aligned - 0x8f57e2d8
ERROR: v7_dcache_inval_range - start address is not aligned - 0x8f57e2e0
ERROR: v7_dcache_inval_range - stop address is not aligned - 0x8f5802e0
Using default environment

Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>

common/env_mmc.c

@@ -192,11 +192,12 @@ void env_relocate_spec(void)
 	u32 offset1, offset2;
 	int read1_fail = 0, read2_fail = 0;
 	int crc1_ok = 0, crc2_ok = 0;
-	env_t *ep, *tmp_env1, *tmp_env2;
+	env_t *ep;
 	int ret;
 
-	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
-	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
+
 	if (tmp_env1 == NULL || tmp_env2 == NULL) {
 		puts("Can't allocate buffers for environment\n");
 		ret = 1;
@@ -266,8 +267,6 @@ err:
 	if (ret)
 		set_default_env(NULL);
 
-	free(tmp_env1);
-	free(tmp_env2);
 #endif
 }
 #else /* ! CONFIG_ENV_OFFSET_REDUND */