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_driver_isp/include/driver/isp_core.h

@@ -32,7 +32,7 @@ typedef struct {
     uint32_t h_res;                               ///< Input horizontal resolution, i.e. the number of pixels in a line
     uint32_t v_res;                               ///< Input vertical resolution, i.e. the number of lines in a frame
     color_raw_element_order_t bayer_order;        ///< Bayer order
-    uint32_t dma_burst_size;                      ///< DMA output burst length in units of 64-bit beats. Set to 0 to use default value 16
+    uint32_t dma_burst_size;                      ///< DMA output burst length in units of 64-bit beats. Set to 0 to use the driver default
     int intr_priority;                            ///< The interrupt priority, range 0~3, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)
     struct {
         uint32_t bypass_isp   : 1;                ///< Bypass ISP pipelines