uboot-imx

MLK-19023-2 imx: epdc: Eliminate unaligned cache flush

Meet such warning during boot with EPDC splash screen enabled, because the
flushed waveform buffer size is not aligned to cacheline size
   CACHE: Misaligned operation at range [ff027d00, ff270d99]

Since we have enough 4MB buffer allocated, round up the flushed size to
eliminate the warning.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 211af0d11f4472d7575b54ad5d14e79f77e71b6a)
(cherry picked from commit 776cd6799e7bb97967a5ee480dbf199bc6ec2586)