usb:udc:s3c: Reduce dcache invalidate range for UDC receive buffer
The s3c udc driver sends data in a max packet size. Therefore the dcache
invalidate range shall be equal to max packet, not the entire
DMA_BUFFER_SIZE.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>
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