rk3188: add bootloader generator for rk3188

rk3188 pre-loader binaries are not managed in rkbin,
add them and make its version from v2.00.

Generate a rk3188 pre-loader:
tools/boot_merger --rc4 RKBO

rk3188: add bootloader generator for rk3188

rk3188 pre-loader binaries are not managed in rkbin,
add them and make its version from v2.00.

Generate a rk3188 pre-loader:
tools/boot_merger --rc4 RKBOOT/RK3188MINIALL.ini

Change-Id: I38468662eddf0844ff7848ec035d802d5440b9f1
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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