regulator: smd: Add floor and corner operations

regulator: smd: Add floor and corner operations

BugLink: http://bugs.launchpad.net/bugs/1763040
This patch addes the Qualcomm specific functions for setting the floor and
corner voltages on the regulators.

Signed-off-by: Andy Gross <agross@codeaurora.org>
[georgi.djakov@linaro.org: Make work with struct regulator]
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
(cherry picked from commit 976dbf494c836fd009cfcad61f0947239e1ff72f
http://git.linaro.org/landing-teams/working/qualcomm/kernel.git release/qcomlt-4.14)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>