[nvptx, testsuite] Add -misa=sm_35 in nvptx/rotate.c

[nvptx, testsuite] Add -misa=sm_35 in nvptx/rotate.c

When running with target board nvptx-none-run/-misa=sm_30 we run into:
...
FAIL: gcc.target/nvptx/rotate.c scan-assembler-times shf.l.wrap.b32 1
FAIL: gcc.target/nvptx/rotate.c scan-assembler-times shf.r.wrap.b32 1
FAIL: gcc.target/nvptx/rotate.c scan-assembler-not and.b32
...

Fix this by adding an explicit -misa=sm_35 in the test-case.

Tested on nvptx.

gcc/testsuite/ChangeLog:

2022-02-28  Tom de Vries  <tdevries@suse.de>

	* gcc.target/nvptx/rotate.c: Add -misa=sm_35.