S4: rename chipset of ra188 to s905w2.

Change-Id: I71c37daa947b462c5294b4c0e198c4ab6bbcad2d
diff --git a/s4/ra188/bb1st.bin b/s4/s905w2/bb1st.bin
similarity index 100%
rename from s4/ra188/bb1st.bin
rename to s4/s905w2/bb1st.bin
Binary files differ
diff --git a/s4/ra188/device-fip-header.bin b/s4/s905w2/device-fip-header.bin
similarity index 100%
rename from s4/ra188/device-fip-header.bin
rename to s4/s905w2/device-fip-header.bin
Binary files differ