dt-bindings: pinctrl: samsung: drop unused header with register constants

The bindings header for Samsung pin controller DTS pin values (holding
register values in fact) was deprecated in v6.1 kernel in
commit 9d92925 ("dt-bindings: pinctrl: samsung: deprecate header
with register constants").  This was enough of time for users to switch
to in-DTS headers, so drop the bindings header.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240312164428.692552-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: krzk

MAINTAINERS

@@ -17489,7 +17489,6 @@ C:	irc://irc.libera.chat/linux-exynos
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/samsung.git
 F:	Documentation/devicetree/bindings/pinctrl/samsung,pinctrl*yaml
 F:	drivers/pinctrl/samsung/
-F:	include/dt-bindings/pinctrl/samsung.h
 
 PIN CONTROLLER - SINGLE
 M:	Tony Lindgren <tony@atomide.com>