fix(gdma): treat burst size 0 and 1 as burst disabled

The GDMA layer used `max_data_burst_size == 0` as the only way to disable the
data burst. That conflicts with the upstream drivers' convention where a zeroed
config struct means "unset", so users had no way to ask for the driver default
burst size.

GDMA now treats both 0 and 1 as "no data burst": a single-beat burst has no
benefit over the non-burst mode. The MSPI alignment constraint under Flash
Encryption / PSRAM ECC still takes precedence and is reported with a warning.

The upstream drivers using GDMA now apply their own default burst size (16
bytes) when the user leaves `dma_burst_size` as 0, following the UHCI driver:

- esp_async_crc (AHB / AXI GDMA backend)
- esp_async_memcpy (AHB / AXI / LP-AHB / DW_GDMA backend)

Callers that really want no burst can now set `dma_burst_size` to 1.

components/esp_lcd/include/esp_lcd_io_i80.h

@@ -29,7 +29,7 @@ typedef struct {
     gpio_num_t data_gpio_nums[ESP_LCD_I80_BUS_WIDTH_MAX]; /*!< GPIOs used for data lines */
     size_t bus_width;          /*!< Number of data lines, 8 or 16 */
     size_t max_transfer_bytes; /*!< Maximum transfer size, this determines the length of internal DMA link */
-    size_t dma_burst_size;     /*!< DMA burst size, in bytes */
+    size_t dma_burst_size;     /*!< DMA burst size, in bytes, must be a power of 2. Set to 0 to use the driver default. Set to 1 to disable the data burst. */
     /// Extra configuration flags for I80 bus
     struct extra_i80_bus_flags {
         uint32_t allow_pd: 1;   /*!< If set, driver allows the power domain to be powered off when system enters sleep mode.

components/esp_lcd/include/esp_lcd_io_parl.h

@@ -30,7 +30,7 @@ typedef struct {
     uint32_t pclk_hz;        /*!< Frequency of pixel clock */
     parlio_clock_source_t clk_src; /*!< Clock source for the Parlio peripheral */
     size_t max_transfer_bytes; /*!< Maximum transfer size, this determines the length of internal DMA link */
-    size_t dma_burst_size;     /*!< DMA burst size, in bytes */
+    size_t dma_burst_size;     /*!< DMA burst size, in bytes, must be a power of 2. Set to 0 to use the driver default. Set to 1 to disable the data burst. */
     size_t trans_queue_depth; /*!< Transaction queue size, larger queue, higher throughput */
     int lcd_cmd_bits;   /*!< Bit-width of LCD command */
     int lcd_param_bits; /*!< Bit-width of LCD parameter */