ANDROID: GKI: of: property: Add device links support for pinctrl-[0-3]

pinctrl-[0..n] property is used to point to pin controllers. However,
there are other pinctrl-* properties that don't point to suppliers. To
keep the parsing simple, for now, add support only for pinctrl-[0..3]
properties as there's only one or two devices in the tree that have more
than pinctrl-3.

Bug: 144864161
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
(cherry picked from commit 3579c811e2ef195ab0a1c452a3d8966af40bf731)
Change-Id: Ia063ffecc7429c77a9c9ff7c31c431167225a62f