boards/stm32f429i-disc1: fix fmc_sdram_bank_conf_t initializer order

C++20 requires designated initializers to follow struct declaration
order, GCC rejects out-of-order designators as a hard error.

This was latent in C builds but visibles when board headers are compiled
as C++ (e.g. via pkg/radiolib), causing a Murdock CI failure.

Reorder the initializer fields to match the struct declaration order.

Signed-off-by: Baptiste Le Duc <baptiste.le-duc@vates.tech>

Author: baptleduc

boards/stm32f429i-disc1/include/periph_conf.h

@@ -207,12 +207,12 @@ static const fmc_bank_conf_t fmc_bank_config[] = {
             .col_bits = 8,                   /* A8..A0 used for column address */
             .cas_latency = 3,                /* CAS latency is 3 clock cycles */
             .read_delay = 0,                 /* No read delay after CAS */
+            .four_banks = true,              /* SDRAM has four internal banks */
+            .write_protect = false,          /* No write protection */
             .burst_read = false,             /* Burst read mode disabled */
             .burst_write = false,            /* Burst write mode disabled */
-            .burst_len = FMC_BURST_LENGTH_1, /* Burst length is 1 if enabled */
             .burst_interleaved = false,      /* Burst mode interleaved */
-            .write_protect = false,          /* No write protection */
-            .four_banks = true,              /* SDRAM has four internal banks */
+            .burst_len = FMC_BURST_LENGTH_1, /* Burst length is 1 if enabled */
             .timing = {                      /* SDRAM Timing parameters */
                 .row_to_col_delay = 2,       /* Row to column delay (2 clock cycles) */
                 .row_precharge = 2,          /* Row precharge delay (2 clock cycles) */