gen-bios-tar: Update private signing key

Updating from 1024 bits to 4096 bits for a more secure key

Change-Id: Idaa9bcdc04ec4143ff8035c84040646458bf8398
Signed-off-by: Rashmica Gupta <rashmica@linux.ibm.com>
diff --git a/gen-bios-tar b/gen-bios-tar
index 727e040..3468100 100755
--- a/gen-bios-tar
+++ b/gen-bios-tar
@@ -33,20 +33,56 @@
 #
 #################################################################
 private_key=$'-----BEGIN PRIVATE KEY-----
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 -----END PRIVATE KEY-----
 '