drivers: dma: Add buffer reload API for DMA driver
drivers: dma: Add buffer reload API for DMA driver

Config API is meant for initial configuration.

Using config API to reload DMA buffers is inefficient and hence
a reload API is added

Signed-off-by: Sathish Kuttan <88b3ab91bbfd8c103d682ea5f9059cf275a3b834@intel.com>

galak/zephyr,Vudentz/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,explora26/zephyr,nashif/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,ldts/zephyr,punitvara/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,explora26/zephyr,ldts/zephyr,punitvara/zephyr,punitvara/zephyr,finikorg/zephyr,galak/zephyr,ldts/zephyr,ldts/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,finikorg/zephyr