Commonize the repeating pattern for reading the "t-calibration-data"
efuse data in a new function svs_thermal_efuse_get_data(), reducing
the size of this driver.

No functional changes.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20220825184616.2118870-2-nfraprado@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>