dt-bindings: crypto: Drop obsolete mediatek,eip97-crypto

The mediatek,eip97-crypto binding is half abandoned. The driver was
dropped in 2020 as the Mediatek platforms use InsideSecure block and
the driver for it. All the platforms except MT7623 were updated. A
patch to update it was submitted, but never addressed the review
comments.

Link: https://lore.kernel.org/all/[e-mail]/
Signed-off-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

Documentation/devicetree/bindings/crypto/mediatek-crypto.txt

···
-MediaTek cryptographic accelerators
-
-Required properties:
-- compatible: Should be "mediatek,eip97-crypto"
-- reg: Address and length of the register set for the device
-- interrupts: Should contain the five crypto engines interrupts in numeric
-	order. These are global system and four descriptor rings.
-- clocks: the clock used by the core
-- clock-names: Must contain "cryp".
-- power-domains: Must contain a reference to the PM domain.
-
-
-Example:
-	crypto: crypto@1b240000 {
-		compatible = "mediatek,eip97-crypto";
-		reg = <0 0x1b240000 0 0x20000>;
-		interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_LOW>,
-			     <GIC_SPI 83 IRQ_TYPE_LEVEL_LOW>,
-			     <GIC_SPI 84 IRQ_TYPE_LEVEL_LOW>,
-			     <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>,
-			     <GIC_SPI 97 IRQ_TYPE_LEVEL_LOW>;
-		clocks = <&ethsys CLK_ETHSYS_CRYPTO>;
-		clock-names = "cryp";
-		power-domains = <&scpsys MT2701_POWER_DOMAIN_ETH>;
-	};