S4: rename chipset of ra188 to s905w2.

Change-Id: I1b5bf4515041c0ad434332207de51e18b44ff700
diff --git a/s4/ra188/blob-bl40.bin.signed b/s4/s905w2/blob-bl40.bin.signed
similarity index 100%
rename from s4/ra188/blob-bl40.bin.signed
rename to s4/s905w2/blob-bl40.bin.signed
Binary files differ