ARM: dts: exynos: drop deprecated SFR region from MIPI phy

Commit e4b3d38088df ("phy: exynos-video-mipi: Fix regression by adding
support for PMU regmap") deprecated the usage of unit address in MIPI
phy node, in favor of a syscon phandle.  Deprecating was a correct
approach because that unit address was actually coming from Power
Management Unit SFR range so its usage here caused overlapped memory
mapping.

In 2016 commit 26dbadba495f ("phy: exynos-mipi-video: Drop support for
direct access to PMU") fully removed support for parsing that MIPI phy
unit address (SFR range) but the address stayed in Exynos5250 DTSI for
compatibility reasons.

Remove that deprecated unit address from Exynos5250 MIPI phy, because it
has been almost 6 years since it was deprecated and it causes now DT
schema validation warnings:

  video-phy@10040710: 'reg' does not match any of the regexes: 'pinctrl-[0-9]+'

Any out-of-tree users of Exynos5250 DTSI, should update their code to
use newer syscon property.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Alim Akhtar<alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20220314184113.251013-1-krzysztof.kozlowski@canonical.com

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