[nxp][platform][mcxw71_k32w1] Update low-power define (project-chip#36431)

Signed-off-by: Andrei Menzopol <andrei.menzopol@nxp.com>

Author: andrei-menzopol

src/platform/nxp/mcxw71_k32w1/BUILD.gn

@@ -89,7 +89,7 @@ config("nxp_platform_config") {
 static_library("nxp_platform") {
   deps = []
   defines = [
-    "CHIP_DEVICE_K32W1=1",
+    "NXP_DEVICE_K32W1_MCXW7X=1",
     "NXP_USE_MML=1",
   ]