tools/nxstyle: add phy62xx/uart.c into style white list

To skip the style issue:
arch/arm/src/phy62xx/uart.c:59:15: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:64:2: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:65:2: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:70:2: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:71:2: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:75:2: error: Mixed case identifier found
arch/arm/src/phy62xx/uart.c:77:7: error: Mixed case identifier found

Signed-off-by: chao an <[email protected]>

Author: anchao

tools/nxstyle.c

@@ -642,6 +642,12 @@ static const char *g_white_files[] =
 
   "arm-acle-compat.h",
   "arm_asm.h",
+
+  /* Skip Mixed case
+   * arch/arm/src/phy62xx/uart.c:1229:13: error: Mixed case identifier found
+   */
+
+  "phy62xx/uart.c",
   NULL
 };