[MAINTAINERS] Update my email address and step down as arm port maintainer

[Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>]

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Hi all,

I'm stepping down as arm maintainer. Realistically I won't have good access to arm hardware to test patches
for the port in the foreseeable future, or at least the more active M-profile parts of it.
I'm still happy to keep helping with AArch64 though.
I'm also adding myself to the DCO section in the meantime.
A big thank you to the GCC community for giving me the opportunity and special thanks to Richard and Ramana
for guiding me in starting with patch reviews.

Pushing to trunk.

Thanks,
Kyrill

	* MAINTAINERS: Update my email details, remove myself as arm maintainer.
	Add myself to DCO section.

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diff --git a/MAINTAINERS b/MAINTAINERS
index 8f64ee630b45aa230b2c117f5b57c413519b7afb..9a6c41afb12e879adc28b4eb60405566e06e5f63 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -52,7 +52,7 @@ docs, and the testsuite related to that.
 aarch64 port		Richard Earnshaw	<richard.earnshaw@arm.com>
 aarch64 port		Richard Sandiford	<richard.sandiford@arm.com>
 aarch64 port		Marcus Shawcroft	<marcus.shawcroft@arm.com>
-aarch64 port		Kyrylo Tkachov		<kyrylo.tkachov@arm.com>
+aarch64 port		Kyrylo Tkachov		<ktkachov@gcc.gnu.org>
 alpha port		Richard Henderson	<rth@gcc.gnu.org>
 amdgcn port		Julian Brown		<julian@codesourcery.com>
 amdgcn port		Andrew Stubbs		<ams@baylibre.com>
@@ -61,7 +61,6 @@ arc port		Claudiu Zissulescu	<claziss@synopsys.com>
 arm port		Nick Clifton		<nickc@redhat.com>
 arm port		Richard Earnshaw	<richard.earnshaw@arm.com>
 arm port		Ramana Radhakrishnan	<ramana.gcc@gmail.com>
-arm port		Kyrylo Tkachov		<kyrylo.tkachov@arm.com>
 avr port		Denis Chertykov		<chertykov@gmail.com>
 bfin port		Jie Zhang		<jzhang918@gmail.com>
 bpf port		Jose E. Marchesi	<jose.marchesi@oracle.com>
@@ -782,6 +781,7 @@ Nathaniel Shead					<nathanieloshead@gmail.org>
 Nathan Sidwell					<nathan@acm.org>
 Edward Smith-Rowland				<esmithrowland@gmail.com>
 Fangrui Song	                                <maskray@gcc.gnu.org>
+Kyrylo Tkachov					<ktkachov@gcc.gnu.org>
 Petter Tomner					<tomner@bahnhof.se>
 Martin Uecker					<uecker@gcc.gnu.org>
 Jonathan Wakely					<jwakely@redhat.com>