pinctrl: qcom: spmi-gpio: Add pm8998 and pm8005 to binding

Update the binding for two more PMICs supported by the same driver.
While we're here, remove the duplicate pmi8994 lines because that
support got merged twice.

Cc: Rajendra Nayak <rnayak@codeaurora.org>
Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>