arm64: drop stray SBGEMM P/Q/R undefs picked up by other cpu blocks

The edit that added the SBGEMM P/Q/R overrides to the VORTEXM4 block
matched on the SBGEMM UNROLL undef lines, which occur in several
other cpu blocks as well, so the undefs landed in four of them and
broke their setparam compilation under DYNAMIC_ARCH (SBGEMM_DEFAULT_P
undeclared, e.g. for NEOVERSEV1 with GCC). This is what the review
comment about unrelated cpus was about; the overrides themselves were
already dropped in 0bc31e8.

Author: 0tomhoyt

param.h

@@ -3285,9 +3285,6 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #undef SBGEMM_DEFAULT_UNROLL_M
 #undef SBGEMM_DEFAULT_UNROLL_N
-#undef SBGEMM_DEFAULT_P
-#undef SBGEMM_DEFAULT_Q
-#undef SBGEMM_DEFAULT_R
 #define SBGEMM_DEFAULT_UNROLL_M  8
 #define SBGEMM_DEFAULT_UNROLL_N  8
 
@@ -3349,9 +3346,6 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #undef SBGEMM_DEFAULT_UNROLL_M
 #undef SBGEMM_DEFAULT_UNROLL_N
-#undef SBGEMM_DEFAULT_P
-#undef SBGEMM_DEFAULT_Q
-#undef SBGEMM_DEFAULT_R
 #define SBGEMM_DEFAULT_UNROLL_M  16
 #define SBGEMM_DEFAULT_UNROLL_N  8
 
@@ -3860,9 +3854,6 @@ is a big desktop or server with abundant cache rather than a phone or embedded d
 #undef SBGEMM_ALIGN_K
 #undef SBGEMM_DEFAULT_UNROLL_M
 #undef SBGEMM_DEFAULT_UNROLL_N
-#undef SBGEMM_DEFAULT_P
-#undef SBGEMM_DEFAULT_Q
-#undef SBGEMM_DEFAULT_R
 #define SBGEMM_ALIGN_K 4
 #define SBGEMM_DEFAULT_UNROLL_M 8
 #define SBGEMM_DEFAULT_UNROLL_N 4
@@ -3921,9 +3912,6 @@ is a big desktop or server with abundant cache rather than a phone or embedded d
 #undef SBGEMM_ALIGN_K
 #undef SBGEMM_DEFAULT_UNROLL_M
 #undef SBGEMM_DEFAULT_UNROLL_N
-#undef SBGEMM_DEFAULT_P
-#undef SBGEMM_DEFAULT_Q
-#undef SBGEMM_DEFAULT_R
 #define SBGEMM_ALIGN_K 4
 #define SBGEMM_DEFAULT_UNROLL_M 8
 #define SBGEMM_DEFAULT_UNROLL_N 8