board: sama5d2_ptc_ek: adjust the smc timings of nand

To fix the issue of write the rootfs.ubi, adjust the smc timings
configuration of the nand controller.

Based on original work by Wenyou Yang

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

board/atmel/sama5d2_ptc_ek/sama5d2_ptc_ek.c

@@ -33,10 +33,10 @@ static void board_nand_hw_init(void)
 	writel(AT91_SMC_SETUP_NWE(1) | AT91_SMC_SETUP_NCS_WR(1) |
 	       AT91_SMC_SETUP_NRD(1) | AT91_SMC_SETUP_NCS_RD(1),
 	       &smc->cs[3].setup);
-	writel(AT91_SMC_PULSE_NWE(2) | AT91_SMC_PULSE_NCS_WR(3) |
+	writel(AT91_SMC_PULSE_NWE(2) | AT91_SMC_PULSE_NCS_WR(4) |
 	       AT91_SMC_PULSE_NRD(2) | AT91_SMC_PULSE_NCS_RD(3),
 	       &smc->cs[3].pulse);
-	writel(AT91_SMC_CYCLE_NWE(5) | AT91_SMC_CYCLE_NRD(5),
+	writel(AT91_SMC_CYCLE_NWE(6) | AT91_SMC_CYCLE_NRD(5),
 	       &smc->cs[3].cycle);
 	writel(AT91_SMC_TIMINGS_TCLR(2) | AT91_SMC_TIMINGS_TADL(7) |
 	       AT91_SMC_TIMINGS_TAR(2)  | AT91_SMC_TIMINGS_TRR(3)   |