greybus: es?: decrease buffer size to 2k
The firmware is having a hard time with 4k buffers and memory allocation, so decrease the size on the host side to 2k. Also move away from using PAGE_SIZE to denote 4k as that's not the case on all architectures, and someone, someday, might get a rude surprise. Reviewed-by: NAlex Elder <elder@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@google.com>
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