STM32L496: fix RAM size in ARM scatter file

[bcostm]

Description

The RAM size was defined as 10 times the correct size...

Pull request type

[X] Fix
[ ] Refactor
[ ] New target
[ ] Feature
[ ] Breaking change

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 2646
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/7553/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2279
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/7553/

[0xc0170]

@studavekar Please review the failure for this PR (see the CI log)

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 2390
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/7553/2390

[studavekar]

@studavekar Please review the failure for this PR (see the CI log)

CI logs :

java.lang.IllegalArgumentException: The supplied credentials are invalid to login
	at org.jenkinsci.plugins.pipeline.githubstatusnotification.GitHubStatusNotificationStep.getGitHubIfValid(GitHubStatusNotificationStep.java:263)
	at org.jenkinsci.plugins.pipeline.githubstatusnotification.GitHubStatusNotificationStep.getRepoIfValid(GitHubStatusNotificationStep.java:268

Looks like an issue with github : https://status.github.com/messages

github status: