bootutil: Remove arbitrary limit on BOOT_MAX_IMG_SECTORS
bootutil: Remove arbitrary limit on BOOT_MAX_IMG_SECTORS

Count is initialized before it is passed to flash_area_get_sectors. The
flash driver should use count to ensure an overrun does not occur.

Signed-off-by: Kristine Jassmann <kristine.jassmann@renesas.com>

Signed-off-by: Gustavo Henrique Nihei <42b1270cfd1a4f11d4db08d9d441d5d8452cd3b6@espressif.com>

ATmobica/mcuboot,ATmobica/mcuboot,ATmobica/mcuboot,ATmobica/mcuboot,ATmobica/mcuboot