boards: doc: cypress: Update all cypress.com links to use HTTPS

While recent browsers seem to transparently try to use https when
hitting http://www.cypress.com/... URLs, they are effectively not
working anymore, so use https://www.cypress.com/... URLs instead. And
it's a good practice anyway to promote secure links vs. plain http :)

curl http://www.cypress.com/products/32-bit-arm-cortex-m4-psoc-6

 -v -m 5
*   Trying [2a02:26f0:2b00:1a::212:b1ac]:80...
* Connected to www.cypress.com (2a02:26f0:2b00:1a::212:b1ac) port 80
  (#0)
> GET /products/32-bit-arm-cortex-m4-psoc-6 HTTP/1.1 Host:
> www.cypress.com User-Agent: curl/8.1.2 Accept: */*
>
* Operation timed out after 5004 milliseconds with 0 bytes received
* Closing connection 0 curl: (28) Operation timed out after 5004
milliseconds with 0 bytes received

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>