arm: stm32mp: stm32prog: update multiplier is part-size is above SZ_1G

Set multiplier to 'G' if part->size if above SZ_1G.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
1 file changed