confifgs/lpcxpresso-lpc54628: Calibrate delay loop.

configs/lpcxpresso-lpc54628/fb/defconfig

@@ -6,7 +6,7 @@ CONFIG_ARCH_CHIP_LPC54XX=y
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_STDARG_H=y
 CONFIG_ARCH="arm"
-CONFIG_BOARD_LOOPSPERMSEC=18535
+CONFIG_BOARD_LOOPSPERMSEC=21082
 CONFIG_BUILTIN=y
 CONFIG_DRIVERS_VIDEO=y
 CONFIG_EXAMPLES_FB=y

configs/lpcxpresso-lpc54628/nsh/defconfig

@@ -8,7 +8,7 @@ CONFIG_ARCH_IRQBUTTONS=y
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_STDARG_H=y
 CONFIG_ARCH="arm"
-CONFIG_BOARD_LOOPSPERMSEC=18535
+CONFIG_BOARD_LOOPSPERMSEC=21082
 CONFIG_BUILTIN=y
 CONFIG_BUTTONS_LOWER=y
 CONFIG_BUTTONS=y

configs/lpcxpresso-lpc54628/nxwm/defconfig

@@ -11,7 +11,7 @@ CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_STDARG_H=y
 CONFIG_ARCH="arm"
 CONFIG_BOARD_INITIALIZE=y
-CONFIG_BOARD_LOOPSPERMSEC=18535
+CONFIG_BOARD_LOOPSPERMSEC=21082
 CONFIG_BUILTIN=y
 CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y