Clean up STACKSIZE redefinition

kernel/power/ctrmm_kernel_8x4_power8.S

@@ -82,12 +82,10 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endif
 
 #ifdef __64BIT__
-#define STACKSIZE 400
 #define STACKSIZE 592
 #define ALPHA_R_SP 304+192(SP)
 #define ALPHA_I_SP 312+192(SP)
 #else
-#define STACKSIZE 256
 #define STACKSIZE 452
 #define ALPHA_R_SP 224+196(SP)
 #define ALPHA_I_SP 232+196(SP)