Add -downloadPlatform iOS to iOS xcodebuild setup

Fixing 'error: iOS 26.0 Platform Not Installed.'

Alternative: `SELECT_XCODE_LOCATION: "/Applications/Xcode_26.1.app"`
for MacOS15.Xcode26 build

Relates-To: MINOR
Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

scripts/ios/azure_ios_build_psv.sh

@@ -38,4 +38,4 @@ cmake ../ -GXcode \
     -DSIMULATOR=YES \
     -DOLP_SDK_BUILD_EXAMPLES=ON
 
-xcodebuild
+xcodebuild -downloadPlatform iOS