crypto: fsl_hash: fix flush dcache alignment in caam_hash()

crypto: fsl_hash: fix flush dcache alignment in caam_hash()

Loading a FIT kernel image with hash hardware acceleration enabled
(CONFIG_SHA_HW_ACCEL=y) displays the following CACHE warning:

    [...]
    Trying 'kernel-1' kernel subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [16000128, 1673fae8]
    [...]
    Trying 'ramdisk-1' ramdisk subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [1676d6d4, 1737a5d4]
    [...]
    Trying 'fdt-imx6q-xxx.dtb' fdt subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [1673fbdc, 1674b0dc]
    [...]

This patch fixes it.

Tested on:
- i.MX 6 custom board
- LS1021A custom board

Signed-off-by: Benjamin Lemouzy <blemouzy@centralp.fr>
Signed-off-by: Peng Fan <peng.fan@nxp.com>