ARM: dts: socfpga: arria10: Increase NAND boot partition size

Content in NAND boot partition have exceeded 32MB defined in device
tree node.
Increase boot partition size to 37MB to support larger kernel Image
and FPGA bitstream.

Signed-off-by: Teoh Ji Sheng <ji.sheng.teoh@intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>