drivers: ele: getting common macros and functions in header file

Taking out macros and functions from c file and put them in
header file for being used by the other files of crypto driver.

Signed-o

drivers: ele: getting common macros and functions in header file

Taking out macros and functions from c file and put them in
header file for being used by the other files of crypto driver.

Signed-off-by: Sahil Malhotra <sahil.malhotra@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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