cmd/internal/obj/arm: wrong encoding of MOVW to/from FPSR

[benshi001]

endtoend_test.go:228: 03948 (testdata/arm.s:1185)	MOVW	FPSR, R9: have encoding 109130ee, want 109af1ee
endtoend_test.go:228: 03952 (testdata/arm.s:1186)	MOVW	g, FPSR: have encoding 10a120ee, want 10aae1ee

The wanted values are correct encoding.

[gopherbot]

CL https://golang.org/cl/45276 mentions this issue.