misc: fastrpc: increase max init file size to 64 MB

In some cases where Neural Processing is required the size of init process
exceeds default size of 2MB, increase this size to 64MB which is required
for QCS404 CDSP Neural Processing.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>