board: ti: keys: add .key and .crt for fit signature signing

Fit signature mechanism through the standards require the presence of
.key and .crt in the folder with the same name, since we are using our
custMpk only for the signing, update the format to that of standards to
be compatible for packaging easily.

Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>
diff --git a/board/ti/keys/custMpk.crt b/board/ti/keys/custMpk.crt
new file mode 100644
index 0000000..01bd64a
--- /dev/null
+++ b/board/ti/keys/custMpk.crt
@@ -0,0 +1,33 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/board/ti/keys/custMpk.key b/board/ti/keys/custMpk.key
new file mode 100644
index 0000000..adba378
--- /dev/null
+++ b/board/ti/keys/custMpk.key
@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----